Here's the blurb from the 2006 manual.

Towing a Trailer
(Manual Transaxle)

Do not tow a trailer if your vehicle is equipped with a manual transaxle.

Towing a Trailer
(Automatic Transaxle)
Your vehicle can tow a trailer if it is equipped with an
automatic transaxle and the proper trailer towing
equipment. If your vehicle is not equipped as stated
above, do not tow a trailer. To identify the trailering
capacity of your vehicle, you should read the information
in “Weight of the Trailer” that appears later in this
section. Trailering is different than just driving your
vehicle by itself. Trailering means changes in handling,
acceleration, braking, cooling, durability and fuel
economy. Successful, safe trailering takes correct
equipment, and it has to be used properly.

That is the reason for this part. In it are many
time-tested, important trailering tips and safety rules.
Many of these are important for your safety and that of
your passengers. So please read this section carefully
before you pull a trailer.
Load-pulling components such as the engine, transaxle,
wheel assemblies and tires are forced to work harder
against the drag of the added weight. The engine
is required to operate at relatively higher speeds and
under greater loads, generating extra heat. Also,
the trailer adds considerably to wind resistance,
increasing the pulling requirements.

 

Why no love for towing with a manual?